# Autor：YIXI
# date：week05
# 方法二： 使用切片的方法实现

phrase = "Don't panic!"
plist = list(phrase) # list() 可以将 str  to(转) list
print(phrase)
print(plist)

on_str = ''.join(plist[1:3])
print(on_str)
new_phrase = on_str+''.join( plist[5]+plist[4]+plist[7]+plist[6])
print(plist)
print(new_phrase)